Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 11: Poster: Hybrid and Perovskite Photovoltaics

CPP 11.16: Poster

Montag, 7. März 2016, 18:15–21:00, Poster B2

Charge Extraction in Organometallic Perovskite Solar Cells — •Christian M. Wolff, Andreas Paulke, Natalie Schön, and Dieter Neher — Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str.24-25, D-14476 Potsdam-Golm, Germany

We present a study on transfer and extraction of charge carriers in working hybrid perovskite solar cells. With a toolbox comprising transient absorption (TAS), time-resolved PL (TRPL) and spectroscopic-electronic pump-probe experiments including time-delayed collection field (TDCF) and bias-assisted charge extraction (BACE) we follow the fate of charge carriers after excitation. We look at internal processes, such as recombination in the active layer, as well as external processes, such as extraction of charges to the transport layers. Whereas most previous studies have primarily investigated only sections of the solar cells, we apply the outlined techniques to working solar cells with all-organic (e.g. PEDOT and PCBM) or metal oxide (e.g. NiOx and ZnO) extraction layers. With these methods we gain insight into elementary processes in these high efficiency devices. For example, we find that electron transfer to PCBM occurs on a ns-time scale corresponding to mean extraction lengths of less than 20 nm. This finding is consistent with the interpretation, that PCBM molecules penetrate into the cracks between grains [1], in contrast to the picture of flat layers with sleek interfaces.

[1] Paulke, A. et al. Charge Carrier Recombination Dynamics in Perovskite and Polymer Solar Cells. Submitt. Publ. (2016).